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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.75.0.0/24
network10.75.0.0/24
broadcast10.75.0.255
first host10.75.0.1
last host10.75.0.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.75.0.0/24
address00001010.01001011.00000000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001011.00000000.00000000
broadcast00001010.01001011.00000000.11111111
green = network part, grey = host part
hex0x0a4b0000
decimal172687360
reverse dns0.0.75.10.in-addr.arpa
ipv4-mapped::ffff:a4b:0

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.75.0.0/3010.75.0.1 – 10.75.0.210.75.0.3
210.75.0.4/3010.75.0.5 – 10.75.0.610.75.0.7
310.75.0.8/3010.75.0.9 – 10.75.0.1010.75.0.11
410.75.0.12/3010.75.0.13 – 10.75.0.1410.75.0.15
510.75.0.16/3010.75.0.17 – 10.75.0.1810.75.0.19
610.75.0.20/3010.75.0.21 – 10.75.0.2210.75.0.23
710.75.0.24/3010.75.0.25 – 10.75.0.2610.75.0.27
810.75.0.28/3010.75.0.29 – 10.75.0.3010.75.0.31
910.75.0.32/3010.75.0.33 – 10.75.0.3410.75.0.35
1010.75.0.36/3010.75.0.37 – 10.75.0.3810.75.0.39
1110.75.0.40/3010.75.0.41 – 10.75.0.4210.75.0.43
1210.75.0.44/3010.75.0.45 – 10.75.0.4610.75.0.47
1310.75.0.48/3010.75.0.49 – 10.75.0.5010.75.0.51
1410.75.0.52/3010.75.0.53 – 10.75.0.5410.75.0.55
1510.75.0.56/3010.75.0.57 – 10.75.0.5810.75.0.59
1610.75.0.60/3010.75.0.61 – 10.75.0.6210.75.0.63
1710.75.0.64/3010.75.0.65 – 10.75.0.6610.75.0.67
1810.75.0.68/3010.75.0.69 – 10.75.0.7010.75.0.71
1910.75.0.72/3010.75.0.73 – 10.75.0.7410.75.0.75
2010.75.0.76/3010.75.0.77 – 10.75.0.7810.75.0.79
2110.75.0.80/3010.75.0.81 – 10.75.0.8210.75.0.83
2210.75.0.84/3010.75.0.85 – 10.75.0.8610.75.0.87
2310.75.0.88/3010.75.0.89 – 10.75.0.9010.75.0.91
2410.75.0.92/3010.75.0.93 – 10.75.0.9410.75.0.95
2510.75.0.96/3010.75.0.97 – 10.75.0.9810.75.0.99
2610.75.0.100/3010.75.0.101 – 10.75.0.10210.75.0.103
2710.75.0.104/3010.75.0.105 – 10.75.0.10610.75.0.107
2810.75.0.108/3010.75.0.109 – 10.75.0.11010.75.0.111
2910.75.0.112/3010.75.0.113 – 10.75.0.11410.75.0.115
3010.75.0.116/3010.75.0.117 – 10.75.0.11810.75.0.119
3110.75.0.120/3010.75.0.121 – 10.75.0.12210.75.0.123
3210.75.0.124/3010.75.0.125 – 10.75.0.12610.75.0.127
3310.75.0.128/3010.75.0.129 – 10.75.0.13010.75.0.131
3410.75.0.132/3010.75.0.133 – 10.75.0.13410.75.0.135
3510.75.0.136/3010.75.0.137 – 10.75.0.13810.75.0.139
3610.75.0.140/3010.75.0.141 – 10.75.0.14210.75.0.143
3710.75.0.144/3010.75.0.145 – 10.75.0.14610.75.0.147
3810.75.0.148/3010.75.0.149 – 10.75.0.15010.75.0.151
3910.75.0.152/3010.75.0.153 – 10.75.0.15410.75.0.155
4010.75.0.156/3010.75.0.157 – 10.75.0.15810.75.0.159
4110.75.0.160/3010.75.0.161 – 10.75.0.16210.75.0.163
4210.75.0.164/3010.75.0.165 – 10.75.0.16610.75.0.167
4310.75.0.168/3010.75.0.169 – 10.75.0.17010.75.0.171
4410.75.0.172/3010.75.0.173 – 10.75.0.17410.75.0.175
4510.75.0.176/3010.75.0.177 – 10.75.0.17810.75.0.179
4610.75.0.180/3010.75.0.181 – 10.75.0.18210.75.0.183
4710.75.0.184/3010.75.0.185 – 10.75.0.18610.75.0.187
4810.75.0.188/3010.75.0.189 – 10.75.0.19010.75.0.191
4910.75.0.192/3010.75.0.193 – 10.75.0.19410.75.0.195
5010.75.0.196/3010.75.0.197 – 10.75.0.19810.75.0.199
5110.75.0.200/3010.75.0.201 – 10.75.0.20210.75.0.203
5210.75.0.204/3010.75.0.205 – 10.75.0.20610.75.0.207
5310.75.0.208/3010.75.0.209 – 10.75.0.21010.75.0.211
5410.75.0.212/3010.75.0.213 – 10.75.0.21410.75.0.215
5510.75.0.216/3010.75.0.217 – 10.75.0.21810.75.0.219
5610.75.0.220/3010.75.0.221 – 10.75.0.22210.75.0.223
5710.75.0.224/3010.75.0.225 – 10.75.0.22610.75.0.227
5810.75.0.228/3010.75.0.229 – 10.75.0.23010.75.0.231
5910.75.0.232/3010.75.0.233 – 10.75.0.23410.75.0.235
6010.75.0.236/3010.75.0.237 – 10.75.0.23810.75.0.239
6110.75.0.240/3010.75.0.241 – 10.75.0.24210.75.0.243
6210.75.0.244/3010.75.0.245 – 10.75.0.24610.75.0.247
6310.75.0.248/3010.75.0.249 – 10.75.0.25010.75.0.251
6410.75.0.252/3010.75.0.253 – 10.75.0.25410.75.0.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →